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Electromagnetic...

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  • Question 1
    4 / -1

    Choke coil works on the principle of

  • Question 2
    4 / -1

    When the speed of a dc motor increases the armature current

  • Question 3
    4 / -1

    A six pole generator with fixed field excitation develops an e.m.f. of 100 V, when operating at 1500 rpm. At what speed must it rotate to develop 120 V?

  • Question 4
    4 / -1

    The coil of dynamo is rotating in a magnetic field. The developed induced e.m.f. changes and the number of magnetic lines of force also changes. Which of the following conditions is correct

  • Question 5
    4 / -1

    Armature current in dc motor will be maximum when

  • Question 6
    4 / -1

    The armature of dc motor has 20 Ω resistance. It draws current of 1.5 ampere when run by 220 volts dc supply. The value of back e.m.f. induced in it will be

  • Question 7
    4 / -1

    A transformer with efficiency 80% works at 4 kW and 100 V. If the secondary voltage is 200 V, then the primary and secondary currents are respectively.

  • Question 8
    4 / -1

    Fan is based on

  • Question 9
    4 / -1

    A transformer is employed to

  • Question 10
    4 / -1

    What is increased in step-down transformer

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